.box{
    width: 100%;
    height: 100%;
    /* background-color: cadetblue; */
    overflow: hidden;
}
.box-left{
    width: 375px;
    height: 100%;
    /* background-color: aquamarine; */
    float: left;
}
.box-left img{
    width: 100%;
}
.box-header{
    width: calc(100% - 375px);;
    height: 40px;
    /* background-color: antiquewhite; */
    float: left;
    margin: 20px 0px;
}
.logo{
    width: 154px;
    height: 40px;
    /* background-color: burlywood; */
    float: left;
}
.logo img{
    width: 40px;
    float: left;
}
.logo p{
    font-size: 26px;
    float: right;
}
.box-nav{
    width: 352.45px;
    height: 40px;
    /* background-color: turquoise; */
    float: right;
    line-height: 40px;
}
.box-nav p{
    float: left;
    margin: 0 10px;
    color: #838383;
}
.box-nav p:hover{
    color: #ff5c00;
}
.triangle{
    height: 0px;
    width: 0px;
    border: 5px solid transparent;
    border-top: 5px solid #838383;
    position: absolute;
    right: 43px;
    top: 40px;
    transition: all .2s;
}
.box-nav a:hover .triangle{
    border-top: 5px solid #ff5c00;
    transform: rotate(-180deg);
    transform-origin: center 3px;
}
.xiala{
    width: 70px;
    height: 0px;
    overflow: hidden;
    position: absolute;
    right: 50px;
    top: 60px;
    color: #838383;
    text-align: center;
    transition: all .3s;
}
.box-nav a:hover .xiala{
    height: 70px;
}
/* 登录 */
.login{
    width: 450px;
    height: 400px;
    position: absolute;
    top: 200px;
    left: 700px;
    border: 1px solid black;
    padding:40px;
    box-sizing: border-box;
}
.login h2{
    font-size: 26px;
    font-weight: 500;
}
.login input{
    width: 356px;
    height: 52px; 
    margin-bottom: 10px;
}
button{
    width: 356px;
    height: 52px;
    background-color: #f57b35;
}